响应面法优化机械砂磨辅助提取婆枣中原花青素工艺

为了优化深州婆枣中原花青素提取工艺。以深州婆枣为研究对象,利用机械砂磨辅助提取婆枣中原花青素,通过单因素实验和响应面实验优化提取工艺。研究结果表明,机械砂磨辅助提取婆枣中原花青素优化工艺条件为:研料粒径3 mm、研磨时间16 min、研料用量(体积比)30%、研磨温度62℃,液料比25 mL/g、乙醇体积分数61%,在优化工艺条件下婆枣中原花青素得率为1.942%±0.001%。实际验证实验表明,预测回归方程模型预测最大得率与验证试验得率相对误差为0.052%,拟合函数模型是可用的。实验证明机械砂磨波提取深州婆枣中原花青素的工艺是可行的。

氧化铁红矿物染料的制备及在纯棉针织物上的应用

以平均粒径20.25μm的氧化铁红为主要原料,用机械砂磨法制备氧化铁红矿物染料,考察研磨时间、分散剂、研磨介质配比等对矿物染料性质的影响。该法制备的矿物染料平均粒径665 nm,可贮存95 d。将矿物染料用于改性纯棉针织物的染色,优化的染色工艺为:矿物染料40 g/L、黏合剂50 g/L、防泳移剂15 g/L,二浸二乳,轧液率70%,90℃预烘80s,150℃焙烘120s。

Thermo-mechanical properties of bowl-shaped grinding wheel and machining error compensation for grinding indexable inserts

In order to meet the technical requirements of grinding the circumferential cutting edge of indexable inserts, thermo-mechanical properties of bowl-shaped grinding wheel in high speed grinding process and the influence of dimension variations of the grinding wheel on machining accuracy were investigated. Firstly, the variation trends of the dimension due to centrifugal force generated in different wheel speeds were studied and the effect of stress stiffening and spin softening was presented. Triangular heat flux distribution model was adopted to determine temperature distribution in grinding process. Temperature field cloud pictures were obtained by the finite element software. Then, dimension variation trends of wheel structure were acquired by considering the thermo-mechanical characteristic under combined action of centrifugal force and grinding heat at different speeds. A method of online dynamic monitoring and automatic compensation for dimension error of indexable insert was proposed. By experimental verification, the precision of the inserts satisfies the requirement of processing.